Parsing return direction works

parser/func.go

@@ -4,75 +4,6 @@ import "git.tebibyte.media/arf/arf/types"
 import "git.tebibyte.media/arf/arf/lexer"
 import "git.tebibyte.media/arf/arf/infoerr"
 
-// operatorTokens lists all symbolic tokens that can act as a command to a
-// phrase.
-var operatorTokens = []lexer.TokenKind {
-        lexer.TokenKindPlus,
-        lexer.TokenKindMinus,
-        lexer.TokenKindIncrement,
-        lexer.TokenKindDecrement,
-        lexer.TokenKindAsterisk,
-        lexer.TokenKindSlash,
-        lexer.TokenKindExclamation,
-        lexer.TokenKindPercent,
-        lexer.TokenKindPercentAssignment,
-        lexer.TokenKindTilde,
-        lexer.TokenKindTildeAssignment,
-        lexer.TokenKindEqualTo,
-        lexer.TokenKindNotEqualTo,
-        lexer.TokenKindLessThanEqualTo,
-        lexer.TokenKindLessThan,
-        lexer.TokenKindLShift,
-        lexer.TokenKindLShiftAssignment,
-        lexer.TokenKindGreaterThan,
-        lexer.TokenKindGreaterThanEqualTo,
-        lexer.TokenKindRShift,
-        lexer.TokenKindRShiftAssignment,
-        lexer.TokenKindBinaryOr,
-        lexer.TokenKindBinaryOrAssignment,
-        lexer.TokenKindLogicalOr,
-        lexer.TokenKindBinaryAnd,
-        lexer.TokenKindBinaryAndAssignment,
-        lexer.TokenKindLogicalAnd,
-        lexer.TokenKindBinaryXor,
-        lexer.TokenKindBinaryXorAssignment,
-}
-
-// isTokenOperator returns whether or not the token is an operator token.
-func isTokenOperator (token lexer.Token) (isOperator bool) {
-	for _, kind := range operatorTokens {
-		if token.Is(kind) {
-			isOperator = true
-			return
-		}
-	}
-
-	return
-}
-
-// validPhraseStartTokens lists all tokens that are expected when parsing the
-// first part of a phrase.
-var validPhraseStartTokens = append (
-	validArgumentStartTokens,
-	operatorTokens...)
-	
-// validBlockLevelPhraseTokens lists all tokens that are expected when parsing
-// a block level phrase.
-var validBlockLevelPhraseTokens = append (
-	validArgumentStartTokens,
-	lexer.TokenKindNewline,
-	lexer.TokenKindReturnDirection)
-	
-// validDelimitedPhraseTokens is like validBlockLevelPhraseTokens, but it also
-// includes a right brace token.
-var validDelimitedPhraseTokens = append (
-	validArgumentStartTokens,
-	lexer.TokenKindNewline,
-	lexer.TokenKindIndent,
-	lexer.TokenKindRBracket,
-	lexer.TokenKindReturnDirection)
-
-
 // controlFlowNames contains a list of all command names that must have a block
 // underneath them.
 var controlFlowNames = []string {